Human hibernation has made some strides recently. I think a year or so ago a Wired mag article said the only significant unsolved problem is shivering. They have a cocktail of drugs that makes hibernation possible apart from the fact that people shiver at low temps.
If they solve this, I will gladly prefer to be shipped as cargo on a sail boat or airship so long as someone tends to a heart monitor to ensure a few heartbeats per min or whatever is still happening. No more Gestappo airport security, stresses of delayed flights, screaming babies, people eating Camembert cheese within 5 meters of you. You age at like ⅓ the rate in hibernation (or something like that). I’d gladly trade a week of reduced useful lifetime in exchange for a later death (experiencing more of the future than otherwise possible). The idea of being able to easily flip the middle finger to Boeing would also be a nice perk. (#boycottBoeing)
The infrastructure and labor cost of adding hospital onto a plane ticket is an extreme step for reducing aircraft emissions.
Can I just get a train and a culture that supports it instead?
If you think the infra cost is high for putting a doctor or nurse onboard a vessel, just wait until you see the price tag for tunneling under the Atlantic or Pacific ocean.
BTW, I don’t think anyone here proposed hibernation on an airplane. The hibernation would of course be done on the slow means of transport (train, cargo ship, airship) to get people off airplanes. IOW, it’s a way to get what you’re asking for: a culture that supports ground transport.
Obstacles to getting a train culture today
The main problem with asking for a culture of train travel across very long distances /today/ is that it’s a very expensive culture (both in time and money). The trains are also a disaster in Europe administratively (different prices¹ for the same train purchased from different vendors, train tickets in Germany unbuyable unless you run their proprietary smart phone app, exclusive discounts only for app users, international rail ticketing site pushes CAPTCHAs [Belgium], GDPR-violating cookies [Germany], etc). In Belgium even a short 1½—3 hour trip is less than half the price by bus than by slow train, and the bus is about the same speed as the slow train. I’ve quit trains for these reasons.
Getting a train culture in the US is also a tall ask considering how poorly networked it is. Many major cities have no train station for passenger trains. Amtrack is the only game in town and it’s slow diesel engines. When people take an Amtrack, it’s really just for the 1-off novelty of experiencing a train.